diff --git a/jsonversation/aio/models.py b/jsonversation/aio/models.py
index 5b32300..8b01fac 100644
--- a/jsonversation/aio/models.py
+++ b/jsonversation/aio/models.py
@@ -31,7 +31,17 @@ def __init__(self) -> None:
         self._parsed_keys = []
         self._value = {}
 
-        for key, type_hint in type(self).__annotations__.items():
+        # initialize keys for potential parent classes
+        for cls in self.__class__.mro()[1:-1]:
+            if cls.__name__ == "Object" or cls.__name__ == "StreamingObject":
+                break
+
+            self._initialize_attributes(cls.__annotations__)
+
+        self._initialize_attributes(type(self).__annotations__)
+
+    def _initialize_attributes(self, attributes: dict[str, Any]) -> None:
+        for key, type_hint in attributes.items():
             self._keys.append(key)
 
             # Handle List[T]
diff --git a/jsonversation/sync/models.py b/jsonversation/sync/models.py
index 2bbfb35..715fbec 100644
--- a/jsonversation/sync/models.py
+++ b/jsonversation/sync/models.py
@@ -5,16 +5,23 @@
 
 
 class StreamingObject[T]:
+    _on_complete_funcs: list[Callable[[T], None]]
+
+    def __init__(self) -> None:
+        self._on_complete_funcs = []
+
     def update(self, value: T) -> None:
         return None
 
     def _complete(self) -> None: ...
 
+    def on_complete(self, func: Callable[[T], None]) -> None:
+        self._on_complete_funcs.append(func)
+
 
 class Object(StreamingObject[dict[str, Any]]):
     _keys: list[str]
     _parsed_keys: list[str]
-    _on_complete_funcs: list[Callable[[dict[str, Any]], None]]
     _value: dict[str, Any]
 
     def __init__(self) -> None:
@@ -22,9 +29,18 @@ def __init__(self) -> None:
         self._keys = []
         self._parsed_keys = []
         self._value = {}
-        self._on_complete_funcs = []
 
-        for key, type_hint in type(self).__annotations__.items():
+        # initialize keys for potential parent classes
+        for cls in self.__class__.mro()[1:-1]:
+            if cls.__name__ == "Object" or cls.__name__ == "StreamingObject":
+                break
+
+            self._initialize_attributes(cls.__annotations__)
+
+        self._initialize_attributes(type(self).__annotations__)
+
+    def _initialize_attributes(self, attributes: dict[str, Any]) -> None:
+        for key, type_hint in attributes.items():
             self._keys.append(key)
 
             # Handle List[T]
@@ -167,23 +183,19 @@ def get_value(self) -> list[T]:
         return self._values
 
 
-class Atomic[T](StreamingObject[T]):
+class Atomic[T](StreamingObject[T | None]):
     _is_empty: bool
     _value: T | None
-    _on_complete_funcs: list[Callable[[T | None], None]]
 
     def __init__(self, item_cls: type[T]) -> None:
         self._is_empty = True
         self._value = None
         self._on_complete_funcs = []
 
-    def update(self, value: T) -> None:
+    def update(self, value: T | None) -> None:
         self._value = value
         self._is_empty = False
 
-    def on_complete(self, func: Callable[[T | None], None]) -> None:
-        self._on_complete_funcs.append(func)
-
     def _complete(self) -> None:
         if not self._is_empty:
             for func in self._on_complete_funcs:
diff --git a/pyproject.toml b/pyproject.toml
index a52d2ed..7417a42 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "jsonversation"
-version = "0.1.2"
+version = "0.1.3"
 description = "Fast and type-safe JSON stream parser"
 authors = [{name = "Vetted.ai Engineering", email = "engineering@vetted.ai"}]
 readme = "README.md"
diff --git a/tests/aio/models/test_object.py b/tests/aio/models/test_object.py
index b3dd541..6d45c53 100644
--- a/tests/aio/models/test_object.py
+++ b/tests/aio/models/test_object.py
@@ -763,3 +763,15 @@ async def footer_callback(value: str) -> None:
 
     assert footer_completed == ["Stream Footer"]  # Completed on final _complete()
     assert len(completed_values) == 1
+
+
+def test_object_creation_with_parent_classes() -> None:
+    class ParentObject(jv.Object):
+        name: jv.String
+
+    class ChildObject(ParentObject):
+        test_field: jv.String
+
+    o = ChildObject()
+
+    assert o.__getattribute__("name") is not None
diff --git a/tests/sync/models/test_object.py b/tests/sync/models/test_object.py
index 32abad1..3570c98 100644
--- a/tests/sync/models/test_object.py
+++ b/tests/sync/models/test_object.py
@@ -755,3 +755,15 @@ def footer_callback(value: str) -> None:
 
     assert footer_completed == ["Stream Footer"]  # Completed on final _complete()
     assert len(completed_values) == 1
+
+
+def test_object_creation_with_parent_classes() -> None:
+    class ParentObject(jv.Object):
+        name: jv.String
+
+    class ChildObject(ParentObject):
+        test_field: jv.String
+
+    o = ChildObject()
+
+    assert o.__getattribute__("name") is not None
diff --git a/uv.lock b/uv.lock
index 722a8fa..286fe82 100644
--- a/uv.lock
+++ b/uv.lock
@@ -103,7 +103,7 @@ wheels = [
 
 [[package]]
 name = "jsonversation"
-version = "0.1.0"
+version = "0.1.3"
 source = { virtual = "." }
 dependencies = [
     { name = "jiter" },